Examine source code of Random abstract

{
  "theme": {
    "images": {
      "theme_frame": "header.jpg"
    },
    "colors": {
      "frame": "#403b3b",
      "tab_background_text": "#785c5c"
    }
  },
  "version": "2.0",
  "name": "Random abstract",
  "manifest_version": 2,
  "description": "a random abstract"
}